So pretty much you want to ditch the factory sub frame, transmission, and most of the unibody, create all custom pieces to remount the engine, and trans, then run a drive shaft to the rear and completely redo the rear suspension to mount an axle. sounds like a lot of pointless work to me.
you forgot about rerouting the exhaust.
No more GP 04 Impala SS Indy:
Gen V 3.4”|FWI|N* TB lq4 MAF|1.9 Modded Rockers|F&R Plogs|ZZP 3" Catted DP|ZZP 2.5" Catback|